My guess will be
$\Delta S_\mathrm{(system)}$ : increase [because heat is flowing into the system]
$\Delta S_\mathrm{(surrounding)}$: decrease [because heat is leaving the environment]
$\Delta S_\mathrm{(universe (sys+surr))}$ : $0$, because it is a reversible process.
Please confirm if my reasonings are correct. Thank you